We report the discovery of four kpc-scale binary AGNs. These objects were originally selected from the Sloan Digital Sky Survey based on double-peaked [O III] 4959,5007 emission lines in their fiber spectra. The double peaks could result from pairing active supermassive black holes (SMBHs) in a galaxy merger, or could be due to bulk motions of narrow-line region gas around a single SMBH. Deep near-infrared (NIR) images and optical slit spectra obtained from the Magellan 6.5 m and the APO 3.5 m telescopes strongly support the binary SMBH scenario for the four objects. In each system, the NIR images reveal tidal features and double stellar components with a projected separation of several kpc, while optical slit spectra show two Seyfert 2 nuclei spatially coincident with the stellar components, with line-of-sight velocity offsets of a few hundred km/s. These objects were drawn from a sample of only 43 objects, demonstrating the efficiency of this technique to find kpc-scale binary AGNs.
Type 2 Active Galactic Nuclei with Double-Peaked [OIII] Lines. II. Single AGNs with Complex Narrow-Line Region Kinematics are More Common than Binary AGNs
Kiloparsec-scale Spatial Offsets in Double-peaked Narrow-line Active Galactic Nuclei. I. Markers for Selection of Compelling Dual Active Galactic Nucleus Candidates
具有kpc尺度分离的双活动星系核(AGN)的合并残余星系应该是广泛存在的,这是星系合并和触发气体吸积到超大质量黑洞上的结果,但很少观察到双活动星系核。斯隆数字巡天中具有双峰窄活动星系核发射线的星系核是可能的双重活动星系核候选者,但它们的双峰轮廓也可能是气体运动学或活动星系核驱动的流出和喷流在小或大尺度上的结果。为了区分这两种情况,我们利用Lick、Palomar和MMT天文台对SDSS中81个双峰窄线活动星系核在0.03 < z < 0.36处进行了长缝光谱观测,获得了活动星系核辐射的空间分布。我们发现,所有81个系统都表现出双活动星系核的发射分量与~kpc的投影空间分离的天空,这表明他们是由kpc尺度的双重活动星系核或kpc尺度的外流,喷流,或旋转的气体盘。此外,我们发现,子样本(58%)的对象与空间紧凑的发射成分可能优先产生的双重活动星系核,而子样本(42%)的空间扩展的发射成分可能优先产生的活动星系核流出。我们还发现,对于32%的样本的两个活动星系核的发射组件优先与宿主星系主轴对齐,预期的双活动星系核在宿主星系的潜在轨道。我们的研究结果既缩小了产生双重活动星系核成分的可能物理机制的列表,并提出了从双峰窄线活动星系核的完整样本中选择最有希望的双重活动星系核候选者的几个观测标准。使用这些标准,我们确定了17个最引人注目的双重活动星系核候选者在我们的样本。
Merger-driven Fueling of Active Galactic Nuclei: Six Dual and Offset Active Galactic Nuclei Discovered with Chandra and Hubble Space Telescope Observations
Chandra X-ray and Hubble Space Telescope Imaging of Optically Selected kiloparsec-Scale Binary Active Galactic Nuclei I. Nature of the Nuclear Ionizing Sources
The scaling relations between the black hole (BH) mass and soft lag properties for both active galactic nuclei (AGNs) and BH X-ray binaries (BHXRBs) suggest the same underlying physical mechanism at work in accreting BH systems spanning a broad range of mass. However, the low-mass end of AGNs has never been explored in detail. In this work, we extend the existing scaling relations to lower-mass AGNs, which serve as anchors between the normal-mass AGNs and BHXRBs. For this purpose, we construct a sample of low-mass AGNs ($M_{\rm BH}<3\times 10^{6} M_{\rm \odot}$) from the XMM-Newton archive and…
Chandra Discovery of 10 New X-Ray Jets Associated With FR II Radio Core-Selected AGNs in the MOJAVE Sample
Chandra X射线观测站是研究活动星系核(AGN)喷流高能辐射过程的重要工具,我们从射电通量限制的MOJAVE(Monitoring of Jets in AGN with VLBA Experiments)高度相对论性喷流样本中选取了27个AGN样本,在千秒尺度上寻找X射线与射电辐射之间的相关性。该样本由所有MOJAVE类星体组成,这些类星体在1.4 GHz处具有超过100 mJy的扩展无线电发射和至少3”大小的无线电结构。钱德拉以前的观测已经揭示了样品中14个成员中的11个中的X射线射流,我们对其余13个源进行了新的观测。在后者中,10个有X射线喷射,使总体检测率达到约78%。我们的选择标准,这是基于高度紧凑,相对论束喷流发射和大的扩展无线电流量,从而提供了一个有效的方法来发现新的X射线喷流与活动星系核。探测到的X射线喷流形态一般与无线电发射有很好的相关性,除了那些在无线电波段显示出急剧弯曲的喷流。这些强大的FR II(Fanaroff-Riley II型)喷流的X射线发射机制可以解释为相对论喷流中的电子对宇宙微波背景(IC/CMB)光子的逆康普顿散射。我们推导出的喷气机的视角,假设一个非弯曲,非减速模型,通过使用超光速秒差距尺度的速度以及参数来自逆康普顿X射线模型。我们使用这些角度来计算最适合的多普勒和体积洛伦兹因子的射流,以及它们的可能范围,这导致在某些情况下的体积洛伦…
Lyman-alpha Blobs Like Company : The Discovery of A Candidate 100 kpc Lyman-alpha Blob Near to A Radio Galaxy with A Giant Lyman-alpha halo, B3 J2330+3927 at z=3.1
Using Suzaku data, we had found a $3.4σ$ evidence for the X-ray emitting warm-hot circumgalactic medium (CGM) in the L$^\star$ galaxy NGC 3221. Here we present XMM-Newton data and outline an efficient, rigorous and well-defined method to extract the faint CGM signal. We confirm the CGM detection at $4σ$ significance within 30-200 kpc of the galaxy. We claim with $99.62\%$ confidence that the CGM is extended beyond $150$ kpc. The average temperature of the CGM is 2.0$^{+0.2}_{-0.3} \times 10^6$ K, but it is not isothermal. We find suggestive evidence for a declining temperature gradient out to …